JP4386649B2 - Pointer instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pointer instrument, and is particularly suitable for use in a pointer instrument mounted on a vehicle.
[0002]
[Prior art]
Conventionally, a pointer instrument composed of a scale plate, a pointer, a rotating inner unit, and a CPU that controls the operation of the rotating inner unit has a pointing position where the pointer points to a position that deviates from the target rotating position. The characteristic value is as follows. The characteristic value is caused by a misalignment between the rotating inner unit and the pointer, a misalignment between the scale board and the rotating inner unit, and the like. Therefore, the characteristic value is different for each pointer instrument.
[0003]
On the other hand, a pointer instrument that includes a memory that stores characteristic values, corrects the sensor detection value with the stored characteristic values, and controls the operation of the rotating internal unit by the CPU has been proposed (for example, , See Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 3-4218
[Problems to be solved by the invention]
By the way, after the pointer instrument is shipped to the market, if the components that constitute the pointer instrument such as the above-mentioned rotary inner unit, CPU, and memory fail, it is difficult to replace and repair only the failed part. Therefore, in the conventional structure, the entire pointer instrument has to be replaced, and the maintenance cost is high.
[0006]
On the other hand, the inventor forms a display member from the scale plate, the pointer, and the rotating internal unit, a control member from the memory and CPU in which the above characteristic values are stored, and a pointer instrument that combines both members. We studied and tried to make it possible to replace only the member that contains the failed part.
[0007]
However, if the structure is simply divided into both members and combined, the characteristic value is different for each display member. Therefore, when the display member is replaced, the characteristic value stored in the memory is stored. And the problem that the characteristic value which the display member after replacement | exchange has will become a different value arises. The same problem occurs when the control member is replaced.
[0008]
In view of the above points, an object of the present invention is to reduce the maintenance cost of a pointer instrument.
[0009]
[Means for Solving the Problems]
To achieve the above object, according to the invention of claim 1, the scale unit indicating the physical quantity (11a) is formed dial (11), guidance indicating scale portion (11a) (12) and guidance (12) the rotation in the machine for rotating (13) a display member having (10), first storage means for characteristic values are stored on the characteristics of the display member (10) (21, 21a) and first storage means (21 , 21a as well as correcting the measured value of the physical quantity on the basis of the stored characteristic values), the corrected control having a control means for controlling (22) the operation of the based on the measurement values turning the machine (13) A second storage means (14) having a member (20) and storing a characteristic value is provided in the display member (10), and one of the display member (10) and the control member (20) is replaced. In addition, the display member after the replacement In (10) and the control member (20), the characteristic value stored in the first storage means (21, 21a) provided in the control member (20) is used as the second storage means provided in the display member (10). The characteristic value stored in (14) can be rewritten.
[0010]
Thereby, after the pointer instrument is shipped to the market, when a part constituting the display member (10) such as the rotating inner unit (13) breaks down, the display member (10) and the control member (20) Of these, only the display member (10) is replaced, and the characteristic value stored in the second storage means (14) provided in the replaced display member (10) is stored in the first storage means (21, 21a). The characteristic value can be rewritten. Therefore, the characteristic value memorize | stored in the 1st memory | storage means (21, 21a) can be matched with the characteristic value which the display member (10) after replacement | exchange has.
[0011]
Further, when a part constituting the control member (20) such as the control means (22) fails, only the control member (20) of the display member (10) and the control member (20) is replaced. The characteristic values stored in the second storage means (14) can be stored in the first storage means (21, 21a) of the control member (20). Therefore, the characteristic value memorize | stored in the 1st memory | storage means (21, 21a) of the control member (20) after replacement | exchange can be matched with the characteristic value which a display member (10) has.
[0012]
As described above, according to the present invention, when one of the display member (10) and the control member (20) fails, the first storage means (21, 21) is replaced while only the failed member is replaced. Since the characteristic value stored in 21a) can be adapted to the characteristic value of the display member (10), it can be repaired by replacing only the failed member, and the maintenance cost of the pointer instrument can be reduced. be able to.
[0013]
As in the second aspect of the invention, a display body displayed by at least one of a two-dimensional code, a one-dimensional code, a dot mark, an IC chip, a symbol, a character, and a number is stored in the second storage means (14). It is suitable for use.
[0014]
In the invention according to claim 3, the display member (10) has a plurality of pointers (12) and a plurality of rotating inner units (13), and the operation of the plurality of rotating inner units (13) is one. It is characterized by being controlled by the control means (22).
[0015]
Here, the control means (22) for controlling the operation of the plurality of rotary inner machines (13) is expensive. Therefore, when the display member (10) breaks down, it is not necessary to replace the control means (22) which is an expensive part. Therefore, the present invention is applied to a pointer instrument to which such control means (22) is applied. Is preferred.
[0016]
In addition, the code | symbol in the parenthesis of each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
(First embodiment)
This embodiment is an example in which the present invention is applied to a pointer instrument for a vehicle, and the pointer instrument is configured so that the display member 10 and the control member 20 can be electrically connected independently as shown in FIG. Yes. Below, the structure of each member 10 and 20 is demonstrated.
[0019]
The indicator instrument is disposed on an instrument panel provided in a vehicle compartment of the vehicle as a vehicle speed meter, an engine speed meter, a water temperature meter that displays the temperature of engine cooling water, and a fuel meter that displays the remaining amount of fuel. FIG. 2 is a front view showing only the vehicle speedometer. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.
[0020]
The display member 10 includes a scale plate 11 on which a scale portion 11a indicating a physical quantity is formed, a light guide plate 11d that emits illumination light from the back surface to the surface of the scale plate 11, a pointer 12 that points to the scale portion 11a, and a pointer It is comprised from the rotation internal unit 13 which rotates 12.
[0021]
The rotating inner unit 13 is fixed to the back surface of the light guide plate 11d. The case includes a step motor, a speed reducer, and a pointer shaft 13a. When the rotor of the step motor is rotated, the speed is reduced by the speed reducer and the pointer shaft 13a rotates. The pointer shaft 13 a is disposed so as to extend from the back surface of the scale plate 11 toward the front surface through the through hole of the light guide plate 11 d and the scale plate 11. A rotating base 12a of the pointer 12 is press-fitted and fixed to the pointer shaft 13a.
[0022]
The scale board 11 is formed by printing the scale part 11a on a transparent film. The said scale part 11a is arrange | positioned at circular arc shape, and has shown the physical quantity of the vehicle speed, the engine speed, the engine coolant temperature, and the fuel remaining amount. When the pointer 12 is rotated by the rotation inner unit 13, the pointer 12 rotates along the surface of the scale plate 11, and the scale unit 11 a is indicated by the pointer 12 to display a physical quantity.
[0023]
A light guide plate 11d is laminated on the back surface of the scale plate 11, and light from a light source (not shown) enters from the back surface of the light guide plate 11d. The incident light diffuses inside the light guide plate 11d and spreads throughout the light guide plate 11d. Then, the diffused light is emitted from the surface of the light guide plate 11 d toward the scale plate 11. Thereby, the scale board 11 is transmitted and illuminated.
[0024]
The light guide plate 11d is provided with a QR code display body 14 in which characteristic values relating to the characteristics of the display member 10 are stored. The characteristic values include a displacement in the press-fitting between the pointer shaft 13a of the rotating inner unit 13 and the rotating base 12a of the pointer 12, a misalignment between the light guide plate 11d and the rotating inner unit 13, and a printing position of the scale portion 11a. This is caused by a shift or the like.
[0025]
For example, when the pointer 12 is rotated based on the value detected by the vehicle speed sensor regardless of the characteristic value, the target vehicle speed value (the detected value) and the vehicle speed actually indicated by the pointer 12 are The value is shifted as shown by the one-dot chain line in FIG. Therefore, the amount of deviation (angle?) Is set as a characteristic value, and the value detected by the vehicle speed sensor is corrected by the characteristic value as will be described later, and then the turning inner unit 13 is rotated. .
[0026]
The QR code is a well-known two-dimensional code, which is formed on the back surface of the light guide plate 11d by printing, and corresponds to the second storage means described in the claims.
[0027]
The control member 20 includes a rewritable non-volatile memory 21 such as an EEPROM in which characteristic values relating to the characteristics of the QR code display member 10 are stored, a control means 22 such as a CPU for controlling the operation of the rotary inner unit 13, and the like. EEPROM 21 and a printed wiring board 23 on which a CPU 22 is mounted.
[0028]
FIG. 5 is a view taken in the direction of arrow C in FIG. 4, and the EEPROM 21 stores the same characteristic value as the characteristic value stored in the QR code display 14. The CPU 22 corrects the measured value of the physical quantity (for example, the detected value of the vehicle speed sensor) based on the characteristic value stored in the EEPROM 21 and controls the operation of the rotating inner unit 13 based on the corrected measured value. It has become.
[0029]
Note that the pointer instrument of the present embodiment has a plurality of pointers 12 and rotating inner units 13, and the operation of the plurality of rotating inner units 13 is controlled by one CPU 22. The pointer instrument is capable of multiplex communication with other in-vehicle electrical devices such as an engine ECU, and the transmission / reception in the multiplex communication is controlled by the CPU 22.
[0030]
Reference numeral 31 in FIGS. 3 and 4 denotes a resin case, and the control member 20 is held in the case 31 by fixing the printed wiring board 23 to the case 31.
[0031]
The rotating inner unit 13 is provided with a terminal 13b extending toward the surface of the printed wiring board 23. When the display member 10 is pressed against the surface of the printed wiring board 23, the terminal 13b is provided on the printed wiring board 23. It comes in contact with the terminal and is electrically connected. A facing plate 32 is assembled in the opening of the case 31, whereby the display member 10 is held between the facing plate 32 and the printed wiring board 23.
[0032]
3 and 4 indicate a transparent resin cover made of acrylic or the like, and the cover 33 is assembled to the opening portion of the facing plate 32.
[0033]
Next, a repair method in the present embodiment when a failed part occurs after the pointer instrument is shipped to the market will be described.
[0034]
FIG. 6 is a schematic diagram for explaining a repair method in the case where a part constituting the display member 10 such as the rotating inner unit 13 is broken, and shows a state in which the cover 33 and the facing plate 32 are removed from the case 31. . In this case, only the display member 10 of the display member 10 and the control member 20 is replaced.
[0035]
At the time of this exchange, a computer 41 as a data reading and writing device is connected to the printed wiring board 23 via a wiring 41a. Then, the QR code reading device 42 connected to the computer 41 reads the QR code display 14 provided in the replaced display 10, and the characteristic value data stored in the QR code display 14 is stored in the computer 41. input. Then, the computer 41 rewrites the characteristic value data stored in the EEPROM 21 to the inputted characteristic value data.
[0036]
Thus, the characteristic value stored in the EEPROM 21 can be adapted to the characteristic value of the display member 10 after replacement, and only the display member 10 on the defective side of the display member 10 and the control member 20 is replaced. The maintenance cost of the pointer instrument can be reduced.
[0037]
FIG. 7 is a schematic diagram for explaining a repair method in the case where a part constituting the control member 20 such as the CPU 22 fails, and shows a state where the cover 33 and the turn-back plate 32 are removed from the case 31. In this case, only the control member 20 of the display member 10 and the control member 20 is replaced.
[0038]
At the time of this replacement, the computer 41 is connected to the printed wiring board 23 of the control member 10 after replacement, the QR code display body 14 is read by the QR code reader 42, and the characteristic value stored in the QR code display body 14 is read. Data is input to the computer 41. Then, the computer 41 rewrites the characteristic value data stored in the EEPROM 21 of the control member 10 after the replacement with the inputted characteristic value data.
[0039]
As a result, while the characteristic value stored in the EEPROM 21 after replacement can be adapted to the characteristic value of the display member 10, only the defective control member 20 of the display member 10 and the control member 20 is replaced. The maintenance cost of the pointer instrument can be reduced.
[0040]
Moreover, according to this embodiment, since the display member 10 and the control member 20 are configured independently so as to be electrically connectable, the design of the display member 10 is changed according to the difference in vehicle type and grade, and the control is performed. The member 20 can be shared.
[0041]
(Second Embodiment)
In the first embodiment, the control member 20 includes the printed wiring board 23 on which the EEPROM 21 and the CPU 22 are mounted. The rotating inner unit 13 is directly connected to the printed wiring board 23, whereas In the embodiment, the display member 10 includes a display-side printed wiring board 15 that is separate from the printed wiring board (hereinafter referred to as a control-side printed wiring board) 23, and the display-side printed wiring board 15 includes the turning inner unit 13. The control side printed wiring board 23 and the display side printed wiring board 15 are electrically connected to each other.
[0042]
Specifically, as shown in FIG. 8, the turning inner unit 13 is mounted on the display-side printed wiring board 15, and in this embodiment, the terminal 13b is soldered and mounted. Both printed wiring boards 15 and 23 are connected by a connector 23a by a flexible printed wiring board (FPC) 16.
[0043]
By the way, in the structure in which the turning inner unit 13 is directly connected to the control side printed wiring board 23 as in the first embodiment, when the design of the display member 10 is changed along with the design change according to the difference in the vehicle type and grade, The design of the control side printed wiring board 23 must be changed according to the design change. For example, when the arrangement of the rotary inner unit 13 is changed, the land position of the control side printed wiring board 23 and the design of the wiring pattern are inevitably changed. Therefore, it may be difficult to make the control member 20 common.
[0044]
On the other hand, according to the present embodiment, it is possible to avoid the rotation internal unit 13 being directly connected to the control side printed wiring board 23. Therefore, in the pointer instrument mounted on the vehicle of different vehicle type or grade, the display member The control member 20 can be easily shared regardless of the design change.
[0045]
(Third embodiment)
In the first and second embodiments, the EEPROM 21 as the first storage means and the CPU 22 as the control means are configured separately, but in the present embodiment, the first storage means 21 and the control means 22 are provided. It is composed integrally. Specifically, as shown in FIG. 10, a flash memory 21 a is employed as the first control means, and the flash memory 21 a is built in the CPU 22.
[0046]
(Other embodiments)
In the above embodiment, the QR code display body 14 as the second storage means is provided in the light guide plate 11d. However, the second storage means 14 of the present invention may be provided in the components constituting the display member 10, It is not restricted to the case where it provides in the light-guide plate 11d. For example, the second storage unit 14 may be provided on the dial plate 11.
[0047]
In the above embodiment, a QR code display as a two-dimensional code is adopted for the second storage means 14, but in implementing the present invention, a one-dimensional code, a dot mark, an IC chip, a symbol, a character, and a number are used. The display body may be configured by combining at least one of them with the two-dimensional code. Further, the two-dimensional code may be abolished, and the display body may be configured from at least one of the one-dimensional code, dot mark, IC chip, symbol, character, and number.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a display member and a control member according to a first embodiment of the present invention.
2 is a front view showing only a vehicle speedometer portion of the pointer instrument of FIG. 1; FIG.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
5 is a view taken in the direction of arrow C in FIG.
6 is a schematic diagram for explaining a repair method in the case where a part constituting the display member fails in the pointer instrument of FIG.
7 is a schematic diagram for explaining a repair method when a component constituting the control member fails in the pointer instrument of FIG. 1; FIG.
FIG. 8 is a cross-sectional view of a pointer instrument according to a second embodiment of the present invention.
FIG. 9 is an exploded schematic view showing a display member and a control member according to a second embodiment.
FIG. 10 is an exploded perspective view showing a display member and a control member according to a third embodiment of the present invention.
[Explanation of symbols]
10 display member, 11 scale plate, 11a scale part, 12 pointer,
13 rotating inner unit, 14 QR code (second storage means), 20 control member,
21 EEPROM (first storage means), 22 CPU (control means).

Claims (3)

Graduation part showing a physical quantity (11a) is formed dial (11), the display having the graduation portion pointing to (11a) guidelines (12) and the pointer (12) to rotate the motor for rotating (13) and the member (10),
Based on the characteristic values stored in the first storage means (21, 21a) and the first storage means (21, 21a) in which characteristic values relating to the characteristics of the display member (10) are stored, the measured value of the physical quantity is obtained. is corrected, and a control member having a control means (22) for controlling the operation of the rotation in the machine based on the corrected measurement value (13) (20),
The display member (10) is provided with second storage means (14) in which the characteristic values are stored,
When one of the display member (10) and the control member (20) is replaced, the display member (10) and the control member (20) after the replacement are provided on the control member (20). The characteristic value stored in the first storage means (21, 21a) can be rewritten to the characteristic value stored in the second storage means (14) provided in the display member (10). Pointer instrument. The second storage means (14) is a display body displayed by at least one of a two-dimensional code, a one-dimensional code, a dot mark, an IC chip, a symbol, a character and a number. The indicator instrument described in 1. The display member (10) includes a plurality of the pointer (12) and the rotating inner unit (13),
The pointer instrument according to claim 1 or 2, wherein the operation of the plurality of rotary inner machines (13) is controlled by one control means (22).

Images